I can't say I see the life and EOL of the 800w as fully comparable with the Diamond,
which may start selling with Verizon soon and also sells as a GSM unlocked device. And the Centro 128 was an upgrade to an already successful run of a device already available.
Palm list the Centro as a device selling with many carriers and GSM unlocked, they don't break the 128 out as a separate device listing in the same way that the
800w is treated as a totally separate device with a single carrier. On Palm's site the Centro is listed as having many carriers, while the 800w has just one.
For good or bad and for whatever reasons, the 800w has had only a single carrier for just a 9 month run.